feat(hubspot-integration): add HubSpot script component for production environment

- Introduced a new HubSpot component that dynamically loads the HubSpot tracking script when in production.
- Updated MainLayout to replace TawkTo with HubSpot for improved customer engagement tracking.

worklenz-frontend/src/components/HubSpot.tsx

@@ -0,0 +1,24 @@
+import { useEffect } from 'react';
+
+const HubSpot = () => {
+  useEffect(() => {
+    const script = document.createElement('script');
+    script.type = 'text/javascript';
+    script.id = 'hs-script-loader';
+    script.async = true;
+    script.defer = true;
+    script.src = '//js.hs-scripts.com/22348300.js';
+    document.body.appendChild(script);
+
+    return () => {
+      const existingScript = document.getElementById('hs-script-loader');
+      if (existingScript) {
+        existingScript.remove();
+      }
+    };
+  }, []);
+
+  return null;
+};
+
+export default HubSpot;